First, The In-app Billing Version 3 service only supports managed in-app products so make sure that you specify that the purchase type is 'Managed' when you add new items to your product list in the Developer Console.
In In-app Billing Version 3 API once an item is purchased, it is considered to be "owned" and cannot be purchased again from Google Play. So I think we can say that per default items are non-consumable.
If you want to make this item consumable you have to call the consume function just after the purchase. Calling the consume function will "free" your item and make it "available" again. (Your user will be able to purchase it as many time as he wants)
mHelper.consumeAsync(purchase, mConsumeFinishedListener);
If you don't call the consume function, your item will never be consumed and will act like a non-consumable item.
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